HM903249-210 bearing: complete specifications & equivalents

Specification table

Source: catalog reference (SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 8.2 inch single-row TRB) · extracted 2026-09-28

Parameters extracted from the official SKF Rolling Bearings catalogue (SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 8.2 inch single-row TRB); SKF® and SKF Explorer® are trademarks of AB SKF, used here for identification only — mpnbase is not an authorized SKF distributor. Boundary dimensions are ISO 15 interchangeable; current production values may differ, verify at skf.com.

Cross references & equivalents

Interchange levels: full standard interchange · partial verify parameters · verify manual confirmation required. Links resolve to the equivalent model's specification page where available.

How the HM903249-210 model number is decoded

Housing and abutment design flows from the cup: in HM903249 the 210 cup fixes the 95.25 mm OD, the outer-ring face position and the rib shoulder that the rollers contact under thrust, while the HM 903249 cone determines the 44.45 mm shaft interface; the 30.958 mm width is the assembled pair value.HM903249 is a single-row tapered roller bearing in the HM903200-series inch series: a separable cone-and-cup design for combined radial and one-direction axial load, listed by SKF in SKF catalogue PUB BU/P1 17000.The HM903200-series series assigns 44.45 mm bore, 95.25 mm OD and 30.958 mm width to HM903249; the cone and cup references are not interchangeable with other inch-series pairs even when the bore matches, because the cup profile and rib geometry are series-specific. In SKF suffix language a bare HM903249 is the standard execution; B marks a larger contact angle and Q or J2 mark clearance/cage variants, all quoted separately. Catalogue mass 1000 g for the 44.45×95.25×30.958 mm open execution covers the pressed-steel cage and standard roller complement; sealed or special-clearance variants differ slightly in mass and carry their own order numbers. Because the contact line is tapered, one HM903249 reacts thrust in a single direction; bidirectional shafts need an O or X pair, and a rotating cone on a 44.45 mm shaft typically takes a k5 seat with an H7 housing bore. Journal and housing interface: the 44.45 mm bore takes a k5 shaft seat (upper deviation ~0.089 mm for this diameter range) and the 95.25 mm outside diameter pairs with an H7 housing bore tolerance band of 95.25.000/95.270 mm; the 30.958 mm width defines the shoulder depth, and the 1000 g cone-plus-cup assembly is the dead load on the shaft during thermal expansion calculations.

Typical equipment & failure modes

Selection pitfalls — read before you substitute

• On this 44.45 mm bore, interference and temperature rise consume clearance inside a preloaded pair; calculate the residual clearance after mounting and at operating temperature — an over-tight HM903249 pair heats, loses setting control and smears the roller-rib contact.
• The HM903200-series inch series at 44.45 mm bore (95.25×30.958 mm) follows the Timken cone/cup convention; substitutions must match both the cone and cup reference exactly — interchanging with another series or a metric 3xxxx bearing of the same bore changes OD, width and contact angle, so re-run the pair setting and shoulder-diameter checks before swapping.
• O (back-to-back) pairs are stiffer against moments, X (face-to-face) pairs tolerate misalignment and thermal growth better; choosing the arrangement from the 2D drawing rather than the actual shaft thermal expansion is a common HM903249 mounting error.
• O (back-to-back) pairs are stiffer against moments, X (face-to-face) pairs tolerate misalignment and thermal growth better; choosing the arrangement from the 2D drawing rather than the actual shaft thermal expansion is a common HM903249 mounting error.
• Shaft and housing fillets must clear the bearing chamfer so the 30.958 mm-wide cup seats square; use an undercut or withdrawal groove rather than an oversized radius that locks on the ring face.
• The 124/122 kN ratings are SKF catalogue 17000 values for the basic execution; SKF can revise internal geometry without changing the order number, so keep the catalogue version (PUB BU/P1 17000/1 EN, 2018) with the specification and re-verify for critical drives.
• SKF lists several executions of HM903249 (basic, B steeper angle, Q/J2 clearance variants); they are not interchangeable order numbers — quote the full SKF HM 903249/210 designation when purchasing and match the execution to the mounting arrangement.